A New Preservation Protocol for Seawater Ballast Tanks in Naval Applications

1999 ◽  
Vol 36 (01) ◽  
pp. 11-21
Author(s):  
Miles Y. Kikuta
Keyword(s):  
Service Life ◽  
Cathodic Protection ◽  
Surface Contamination ◽  
Protection System ◽  
Coating System ◽  
Ballast Tank ◽  
Critical Elements ◽  
Ballast Tanks ◽  
Cathodic Protection System ◽  
Sacrificial Cathodic Protection

The reality that a smaller force must continue to meet heavy overseas commitments clearly indicates that high maintenance, manpower intensive, and costly repair processes must continue to be improved. One of the most significant maintenance problems identified by the Fleet was the continual and costly requirement to overhaul the coating system in seawater ballast tanks. This paper reports on the research conducted in conjunction with the Naval Sea Systems Command (NAVSEA) to develop a seawater ballast tank preservation protocol which extends the current 5 to 7 year coating service life to one that is expected to last 20 years. The approach to develop the new preservation protocol is discussed, the critical elements of the new preservation protocol are described, and methodologies for the design of sacrificial cathodic protection system for seawater ballast tanks and for the detection of surface contamination are provided.

Operation and maintenance of Impressed Current Cathodic Protection systems on concrete civil structures

2018 ◽  
Author(s):  
Jacob Brink Jansson ◽  
Ruth Sørensen ◽  
Kirsten Riis
Keyword(s):  
Service Life ◽  
Cathodic Protection ◽  
Protection System ◽  
Civil Structures ◽  
Correct Operation ◽  
Operation And Maintenance ◽  
Number Of Factors ◽  
Protection Systems ◽  
Cathodic Protection System

Cathodic protection is a very well-known method of preventing or stopping reinforcement corrosion and thereby extending the service life of reinforced concrete civil structures. However, a number of factors, which among others are design, materials and components, installation methods, quality of workmanship, and operation and maintenance of the cathodic protection system, have influence on the functionality and effectivity of the cathodic protection system. The optimum design that fulfils the Client''s requirements to cost, traffic disruption, service life, etc. shall be determined in accordance with the structure layout and the ability of the Client''s organisation to conduct operation and maintenance. It is critical to ensure that all components are installed properly to achieve the expected service life of the system. Regular and correct operation and maintenance is also crucial to ensure the functionality and effectivity system.

Computer Simulation and Potential Measurement of the Cathodic Protection System in Ballast Tank

2008 ◽  
Author(s):  
Atsushi Nakayama ◽  
Kenji Amaya ◽  
Norio Yamamoto
Keyword(s):  
Cathodic Protection ◽  
Polarization Resistance ◽  
Protection System ◽  
Numerical Analyses ◽  
Differential Analysis ◽  
Ballast Tank ◽  
Differential Measurement ◽  
Potential Measurement ◽  
Cathodic Protection System ◽  
The Relationship

Numerical analyses and experimental measurements on potential distributions inside a ballast tank were studied. The relationship between the paint conditions and potential distributions was quantitatively examined. The actual potential distribution in a ballast tank were measured. A boundary element method for a cathodic protection system was employed to the numerical analyses. A polarization resistance of a metal was obtained by a laboratory experiment for the numerical analyses. A differential analysis and a differential measurement were proposed. The differential numerical results were compared with the differential experimental results in the ballast tank. It was seen that the differential potential distributions were well modeled in the numerical analyses.

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